DC faults are critical events in a flexible high-voltage dc (HVDC) grid. Thus, ensuring that the power system returns to normal operation rapidly and reliably after fault isolation is very important. This requires HVDC breaker. In overhead line systems under temporary faults, reclosing often required. However, once circuit breaker (DCCB) reclosed directly, large second overcurrent may occur whi...

INTRODUCTION: A critical importance has been attached to altruism and organizational learning capability in the improvement of organizational performance. In light of this significance, the present study investigated the effect of altruism on organizational learning capability with the mediating role of communication conflict and organizational trust in Red Crescent provincial branches of Gilan...

GALLIUM NITRIDE based heterojunction field-effect transistors (HFETs) show great promise for high-frequency, high-power, and high-temperature applications. Many researchers have fabricated AlGaN/GaN HFETs with very impressive results, including a device with a current handling capability of 1.25 A/mm on SiC substrates[2]. Assuming a sheet charge density of 1.4×1013 cm−2, and a saturation veloci...

This paper presents a multilevel converter with regeneration capability. The converter uses several power cells connected in series, each working with reduced voltage and with an active front end at the line side. This paper presents the following: 1) the control method of each cell; 2) the use of phase-shifting techniques to reduce the current and voltage distortion; and 3) criteria to select ...

This paper describes Canadian research and industrial activity in the rapidly expanding field of photonics. The aim and methodology of the document is explained in the preamble. This is followed by a short overview of the document structure, which is organized into four main sections. The first section gives a basic introduction to the science and technology of photonics. Essentially this secti...

This paper proposes a new single phase transformerless Photovoltaic (PV) inverter for grid connected systems. It consists of six power switches, two diodes, one capacitor and filter at the output stage. The neutral of the grid is directly connected to the negative terminal of the source. This results in constant common mode voltage and zero leakage current. Model Predictive Controller (MPC) tec...

every firm learns through firm specific methods. this learning process is operationalized by firm’s knowledge management practices. therefore, knowledge to result in successful learning should be assisted by a combinative framework which can enhance a firms’ absorptive capability. this in turn will play a decisive role for achieving competitive advantage. current literature in strategic managem...